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采用化学沉淀法制备出具有不同形貌(片状、柱状和等轴状等)的纳米SrSO4粉体。采用扫描电镜和X射线衍射仪等对粉体的结构、形貌及生长机制进行了研究。片状SrSO4粉体厚度约100nm,片长约200nm;柱状粉体横向长度为80～150nm,纵向长度为700～800nm;等轴状粉体粒径约80nm。衍射强度对比表明,低能面(002)与(210)晶面相对生长的快慢导致了片状和柱状SrSO4晶体的形成;而反应物浓度的降低、EDTA的络合以及PEG的分散等环境因素的改变降低了晶体生长驱动力,导致球状SrSO4晶体的形成。
Nanometer SrSO4 powder with different morphology (flake, columnar and equiaxed) was prepared by chemical precipitation method. The structure, morphology and growth mechanism of the powders were investigated by scanning electron microscopy and X-ray diffraction. The sheet-like SrSO4 powder has a thickness of about 100 nm and a sheet length of about 200 nm. The columnar powder has a lateral length of 80-150 nm and a longitudinal length of 700-800 nm. The equiaxed powder particle size is about 80 nm. The comparison of diffraction intensity shows that the relative growth speed of the (002) and (210) planes of the low energy planes leads to the formation of lamellar and columnar SrSO4 crystals. The decrease of reactant concentration, the complexation of EDTA and the dispersion of PEG Changes reduce the driving force for crystal growth, resulting in the formation of spherical SrSO4 crystals.